Question

for an A.P ,a=11 and d=1.5 find t13​

Answer 1

a13 = 29

Step-by-step explanation:

GIVEN

a = 11

d = 1.5

n = 13

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TO FIND

t13

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We know that,

an = a1 + ( n - 1 ) × d

a13 = 11 + ( 13 - 1 ) × 1.5

a13 = 11 + 12 × 1.5

a13 = 11 + 18

a13 = 29

a13 = 29

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IMPORTANT FORMULAS

Common Difference Formula

Common Difference FormulaCommon Difference ( D ) = t2 - t1

Arithmetic Sequence Formula

Arithmetic Sequence Formulaan = a1 + ( n - 1 ) × d

Answer 2

Answer:

Question

✳️for an A.P ,a=11 and d=1.5 find t13=?

solution ⬇️

✍️Here. a=11 ,d=1.5, n =13

✍️t13 = a+(n-1)d ... Formula

✍️t13= 11+(13-1)1.5 ... substituting the value

✍️t13 = 11+12 x 1.5

✍️t13 = 11+18

✍️t13 = 29

Step-by-step explanation:

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