Question

for A.P the first two terms are 100.105 what is t15​

Answer 1

Answer:

170

Step-by-step explanation:

we know that,

Tn = a + (n - 1) d

Now,

T15 = 100 + (15-1) 5

T15 = 100 + 14 x 5

T15 = 100 + 70

T15 = 170

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Answer 2

Answer:

170

Step-by-step explanation:

Given the first two terms of an A.P are 100 and 105.

So the common difference between the terms will be

d = 105-100 = 5

As the nth term is 15 and first term is 100 we have

An= A1 + ( n-1)d

A15 = 100 + (15-1)5

A15 = 100 + (14)×5

A15 = 100 + 70

A15= 170