How many four digit numbers can be formed using the digits 1,2,3,4,5,6,7 if the number has to be even.

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°

answer: 12

step-by-step explanation:

i did it myself and i got 4.2 (b) hope its right

step-by-step explanation: