Math, asked by judymie7, 18 hours ago

Two APs have the same first and last terms. The first AP has 21 terms with a common difference is 9. How many terms has the other AP if it's common difference is 4​

Answers

Answered by mehveshmpatel
0

Answer:

a and d is common i.e a1 =a2

tn1 = tn2

t21 = a + (21-1) ×9

= a + (20×9)

= a + (180)

tn2 = a+ (n-1) 4

a + (180) = a + (n-1)×4

180 = 4n - 4

4n = 176

n = 176/4

n = 44

the other AP has 44 terms

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