THE GRADE X CHALLENGE - MATHEMATICS - ARITHMETIC PROGRESSION

How many two digit numbers are there which are divisible by 7?

• 13

• 14

• 15

• None

The 20th  term from the last term of the A.P. 3, 8, 13, ......... 253 is

• 168

• 178

• 158

• 187

If first, second last and last term of an A.P. are -6, 26 and 30 respectively. Then find the number of terms:

• 10

• 11

• 9

• 8

Which term of the A.P. 64, 60, 56, 52, ... is zero?

• 16th

• 17th

• 14th

• 15th

Find the sum of first 20 terms of the list of numbers whose n^th term is given by a_n=3+2n

• 472

• 480

• 504

• None of these

• n(n+1)/2

• 2n(n+1)

• n(n+1)/√2

• 1

If S₁ is the sum of (2n+1) terms of an A.P. and S₂ be the sum of its first (n+1) odd terms, then S₁/S₂ =

• 2n/(n+1)

• (2n+1)/(n+1)

• (n+1)/2n

• (n+1)/n

Sum of first 5 terms of an A.P. is one fourth of the sum of next five terms. If the first term is 2, then the common difference of the A.P. is:

In an A.P. S₃ = 6, S₆ = 3, then it’s common difference is equal to:

The sum of 1, 3, 5, 7, 9............ upto 20 terms is

• 400

• 563

• 472

• 264