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First term from end a = 49

tn = – 11

tn – 1 = – 8

Common difference d = tn – tn – 1 = – 11 – ( – 8) = – 11 + 8 = – 3

Now, By using nth term of an A.P. formula

tn = a + (n – 1)d

where n = no. of terms

a = first term

d = common difference

tn = nth terms

no. of terms n = 4

t4 = 49 + (4 – 1) × ( – 3)

t4 = 49 + 3 × ( – 3)

t4 = 49 – 9 = 40

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