Question

Find a 30 - a20 the AP
a,a+d,a+2d,a+3d...

Answer 1

Answer:

10d which stands for 10 times of Comman Difference.

Step-by-step explanation:

Since a₃₀ = a + 29d; a₂₀ = a + 19d hence,

• aₙ = a + (n - 1)d

→ a + 29d = a + (30 -1)d

→ a + 29d = a + 29d

Similarly,

→ a + 19d = a + (20 - 1)d

→ a + 19d = a + 19d

Hence the results are same,

→ a₃₀ - a₂₀ = a + 29d - a - 19d

→ 10d