Question

The number of terms in the AP 2,5,8,……….,59 is​

Answer 1

Answer:

Step-by-step explanation:

Let us assume that, the total terms in the AP is n .

we have given that,

First term of AP = a = 2

Common difference = d = second term - first term = 5 - 2 = 3

Last term = an = 59 .

total terms = n .

we know that,

an = a + (n - 1)d .

putting all values we get,

→ 59 = 2 + (n - 1)3

→ 59 = 2 + 3n - 3

→ 59 = 3n - 1

→ 59 + 1 = 3n

→ 3n = 60

→ n = 20 Hence, The number of terms in the given AP is 20.

Answer 2

Answer:

sn =n/2(a+an)

Step-by-step explanation:

formula ka use kr ke

610

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