1.

The difference between the 15th term and the 5th term of an A.P is 40. Which number is to be added to its 12

Answer»

The difference between the 15th term and the 5th term = 40

i.e., ten times an of a common difference = 40

Common difference = 40/10 = 4

When we add 8 x common difference we will get 20th term.

The difference between the 12th term and the 20th term = (20 – 12) × common difference

= 8 x 4 = 32

The difference between the first term and the 21th term = (21 – 1) × Common difference

= 20 × = 80



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