Math, asked by DibyanshuDash, 10 months ago


Find the number of terms common to the two A.P.'s 3, 7, 11, ...... 407 and 2, 9, 16, ......, 709.

Answers

Answered by vikas113683
4

Answer:

102

Step-by-step explanation:

In first case

let a=3, an=407

common difference(cd)=7-3

=4

an=a+(n-1)d

407=3+(n-1)4

407=3+4n-4

407=4n-1

407+1= 4n

408= 4n

n=408÷4

n=102

In the second case

a=2,an=709

common difference=9-2

=7

an=a+(n-1)d

709=2+(n-1)7

709=2+7n-7

709=7n-5

709+5=7n

714=7n

n=714÷7

n=102

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