Question

In an arithmetic sequence the sum of first and tenth terms is 25. Find the sum of the fifth and sixth terms

Answer 1

Answer:

Step-by-step explanation:

a1 = 25

a10 = 25

d = 0

S5 = n/2 * {(2a)+(n-1)*d}

S5 = 5/2 {(2*25)+(5-1)*0}

    = 5/2 {50+0}

    = 5/2 * 50

    = 5 * 25

s5 = 125

s6 = s5 + a

    = 125 + 25

    = 150

Answer 2

Answer:

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