Question

Find the 21st term of the A.P. 7,11, 15, ……​

Answer 1

Answer:

21st term = 87

Step-by-step explanation:

a = first term

an = nth term

d = common difference

an = a + ( n - 1 ) × d

an = 7 + 20 × 4

an = 87

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Answer 2

Answer:

87

Step-by-step explanation:

a=7,d=4

tn=a+(n-1) d

t21=7+(21-1)4

=7+20x4

=7+80

=87

t21=87

therefore, the 21st term of an A.P is 87